scholarly journals EXPERIMENTAL STUDY OF THE REFLECTION OF ELASTIC WAVES FROM ROUGH BOUNDARIES

2019 ◽  
Vol 2 (2) ◽  
pp. 203-208
Author(s):  
Yury Kolesnikov ◽  
Ruslan Beysembaev
Keyword(s):  
Experimental Study ◽  
Elastic Waves ◽  
Physical Modeling ◽  
Characteristic Dimension ◽  
Reflection Coefficients ◽  
Rough Boundaries ◽  
Boundary Roughness

The results of physical modeling show that the influence of boundary roughness on its reflectivity depends on the ratio of roughness characteristic dimension and wavelength. The boundary roughness leads to a decrease in the effective reflection coefficients at subcritical and to their increase at supercritical angles of incidence. A change in the azimuth of the plane of incidence with respect to the roughness direction appreciably affects the reflection coefficients only at supercritical angles.

scholarly journals METHOD FOR PRIMARY PROCESSING OF HERE SILKWORM COCOONS BY USING INFRARED RADIATION AND ELASTIC WAVES

2019 ◽  
Vol 2018 (3) ◽  
pp. 30-36
Author(s):  
J Safarov ◽  
◽  
Sh Sultanova ◽  
D Samandarov
Keyword(s):  
Experimental Study ◽  
Experimental Work ◽  
Elastic Waves ◽  
Initial Moisture Content ◽  
Summer Season ◽  
Processing Method ◽  
Full Scale Test ◽  
State Technical ◽  
Primary Processing ◽  
Scale Test

The article discusses the results of an experimental study of the primary processing of silkworm cocoons. In the laboratory of the department of Tashkent State Technical University a full-scale test was carried out for the primary processing of silkworm cocoons. Experimental work was carried out to pacify and dry the living cocoons of the silkworm of the duragay cultivar “MusaffoTola” grown during the summer season. Studies were carried out to determine parameters such as temperature and time of the primary processing of the silkworm in 5- fold repetition.The initial moisture content of live silkworm cocoons was 36–40%. According to the results of laboratory - experimental work, the appearance of mold was observed in 25-30% of processed cocoons of the silkworm, at 55-60 °C in 10 days a butterfly formed in 15-20% of the cocoons. The processed cocoons of the silkworm at a temperature of 75-85 °C deteriorated due to the release of liquid.It was revealed during observations that silkworm cocoons processed in the temperature range 65-70 °С using vibration waves were euthanized within 30 minutes and the cocoons were dried to 10-12% humidity within 10 days at a temperature of 38-42 °С. The use of elastic waves in the processing of cocoons proceeded 5-10% lower compared to the processing method using vibrational waves.

Experimental study on physical modeling of flow mechanism in volumetric fracturing of tight oil reservoir

2021 ◽  
Vol 33 (10) ◽  
pp. 107118
Author(s):  
Xinli Zhao ◽  
Xuewei Liu ◽  
Zhengming Yang ◽  
Fang Wang ◽  
Yapu Zhang ◽  
...  
Keyword(s):  
Experimental Study ◽  
Physical Modeling ◽  
Tight Oil ◽  
Oil Reservoir ◽  
Flow Mechanism ◽  
Tight Oil Reservoir ◽  
Volumetric Fracturing

Reflection of elastic waves from a linear transition layer

1966 ◽  
Vol 56 (2) ◽  
pp. 511-526
Author(s):  
Ravindra N. Gupta
Keyword(s):  
Plane Wave ◽  
Material Properties ◽  
Transition Layer ◽  
Elastic Waves ◽  
Wave Reflection ◽  
Reflection Coefficients ◽  
Angle Of Incidence ◽  
Arbitrary Angle ◽  
S Wave ◽  
Incidence Plane

abstract A separation of P- and S-wave potentials is achieved for an inhomogeneous medium in which density is constant and Lame's parameters, λ and μ, are assumed to vary as λ/λ1 = μ/μ1 = (1 + bz)2 where λ1, μ1 and b are constants. The resulting equations are solved for an arbitrary angle of incidence. Plane wave reflection coefficients are obtained for the situation when the material mentioned above forms a transition layer between two homogeneous, elastic half-spaces. First and/or second-order discontinuities in material properties are permitted at the boundaries of the transition layer. Some numerical results are given.

Experimental study on the physical modeling of loess tunnel-erosion rate

2019 ◽  
Vol 78 (8) ◽  
pp. 5827-5840 ◽  
Author(s):  
Li Wang ◽  
Xi-An Li ◽  
Lin-Cui Li ◽  
Bo Hong ◽  
Jia Liu
Keyword(s):  
Experimental Study ◽  
Physical Modeling ◽  
Erosion Rate

scholarly journals PHYSICAL MODELING OF THE ELASTIC WAVES REFLECTION FROM THE BOUNDARY WITH LOW-VELOCITY AZIMUTHALLY ANISOTROPIC MEDIUM

2020 ◽  
Vol 1 (1) ◽  
pp. 60-71
Author(s):  
K. V. Fedin ◽  
Yu. I. Kolesnikov ◽  
R. N. Beysembaev
Keyword(s):  
Anisotropic Medium ◽  
Elastic Waves ◽  
Physical Modelling ◽  
Reflection Coefficients ◽  
3D Printer ◽  
Azimuthal Dependence ◽  
Low Velocity ◽  
Isotropic Media ◽  
Theoretical Reflection ◽  
Good Agreement

The physical modelling of elastic waves reflected from the boundary between the water and the model of low-velocity azimuthally anisotropic medium was carried out. The model of anisotropic medium was made using 3D printer. The results of experiments showed that the reflection coefficients are practically independent from the azimuth at the angles of incidence less than 25°. At larger angles of incidence, the azimuthal dependence of the reflection coefficients is observed, which is most pronounced at azimuths from 45° to 75°. The results of measurements in the layering direction are in good agreement with the theoretical reflection coefficients for the boundary of isotropic media.

scholarly journals Physical modeling low-waste technological process of the round forging hot stamp

2021 ◽  
Vol 346 ◽  
pp. 01023
Author(s):  
Igor Telegin ◽  
Viktor Telegin
Keyword(s):  
Experimental Study ◽  
Technological Process ◽  
Physical Modeling ◽  
High Efficiency ◽  
Hot Stamping ◽  
Metal Consumption ◽  
Highly Efficient

The paper presents the results of an experimental study highly efficient technological process manufacture of the round forging on a crank hot-stamping press. The high efficiency of this technological process is achieved by reducing its metal consumption. To this end, at the final stamping transition, the forging forging radii were reduced and, accordingly, the allowances for subsequent machining were minimized.

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